Please help with all numbers
Mathematics

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1. There will only be 2 chances, the dollar will become smaller or bigger. Why?
Because in mathematical rules of rounding off numbers:
number below 5 will be round down and 5 and up will be rounded up.
For example:
You have a bill of $6.79 since the
number next to the decimal point in the right is 7, it will be rounded up to
$7.
But if your bill is $6.25, it will be rounded down to $6.00
2. The larger lines with numbers are centimeters, and the smallest lines
are millimeters. Since millimeters are 1/10th of a centimeter,
if you measure 7 marks after a centimeter, it is 1.7 centimeters long.
3. There are two ways of describing, or specifying the members of, a set. One way is by intensional definition, using a rule or semantic description:
 A is the set whose members are the first four positive integers.
 B is the set of colors of the French Flag
The second way is by extensionâ€“ that is, listing each member of the set. An extensional definition is denoted by enclosing the list of members in curly brackets:
 C = {4, 2, 1, 3}
 D = {blue, white, red}.
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